A portable self erecting pet enclosure which provides protection to domesticated animals when the animals are introduced into hostile or new environments. The pet enclosure design has a support system and a nylon webbing cover. The support system is constructed of two concentric flat spring wire loops each having substantially the same diameter. The support system has a foundational bottom loop and a supporting frame loop. The foundational bottom loop defines the outer perimeter of the floor and the supporting frame loop is arranged in a saddleback configuration to support the roof. The supports are contained within support sleeves which are sewn onto the nylon webbing. The pet enclosure apparatus has a small insertion port and a large extraction port. The small insertion port is for easily inserting the animal into the enclosure. The large extraction port is designed so that the pet owner can easily remove the animal. The nylon webbing has a weave spacing which is narrow enough to prevent the animal's paws or jaws from extending out of the pet enclosure, but provides enough space for the cat to pull on the webbing which acts as a modified scratching post. The webbing is strong enough to resist tearing and or ripping of the fibers. The portable self-erecting pet enclosures can be arranged in groups and connected to one another or to a pet door of an existing house through the use of a conduit constructed of the same material.